I don't have a patter yet, but I figure it will be pretty simple due to the size of the miniature and my painting skill.
I DID find this neat color wheel/color scheme web page that I think might help:Color Scheme
The Blue and Green match the main colors I wanted to do for the tartan. I guess that means their suggestion for the third color would be orange. I'm still not sure if orange is the way to go for the trolls, but I may stick with it for a while.
I was also contemplating yet another base change for them and make them "swamp" trolls with water effects for the bases. I've not tried anything like that before and I think the idea is neat. I'm not sure that orange skin would work very well in that case?
Edit for Tartan:
This is a lot like what I wanted to do, just replace the white line with an orange:
The general Troll tactic is to take your axe and put it in the other guy's mouth, beyond that it's a matter of whether or not that axe will be on fire.